Hello--

We have a tabular model that is exposed externally to our clients via msmdpump.dll  (Configure HTTP Access to Analysis Services on Internet Information Services (IIS) 7.0).  

We have also created a proxy to use custom security accessing the cube.  This proxy works fantastic from Excel.  The proxy URL looks like this: https://xxxxx.xxxxx.com/login

However, from Reporting Services, using the URL to the security proxy as the server name, I cannot make a connection. I ran a profiler trace on the server and I see a connection trying to be made to get the database names, but it returns an error that says:

"DataSourceInfo property cannot be overwritten."

I've searched and searched online and found nothing so I'm turning to this forum to see if I can get some help here.

To summarize, the proxy works great from Excel, but does not work from SSRS. It attempts to connect and get the database names, but returns an error.

Any help would be greatly appreciated!!